doc: update SEE ALSO in PDL::Opt::Simplex

Add a link to the out-of-tree PDL::Opt::ParticleSwarm optimizer.

Also update the broken link from 1998 to chem1.nrl.navy.mil with something that
"works" from archive.org

Signed-off-by: Eric Wheeler <perl-pdl@z.ewheeler.org>

Libtmp/Simplex/Simplex.pm

@@ -109,10 +109,26 @@ but only after it has visited every point in your space).
 
 =head1 SEE ALSO
 
-Ron Shaffer's chemometrics web page and references therein:
-C<http://chem1.nrl.navy.mil/~shaffer/chemoweb.html>.
+=over 4
+
+=item L<PDL::Opt::Simplex::Simple> - Use names for Simplex-optimized values
+
+=item L<PDL::Opt::ParticleSwarm> - A PDL implementation of Particle Swarm
+
+=item L<PDL::Opt::ParticleSwarm::Simple> - Use names for Particle Swarm-optimized values
+
+=item Ron Shaffer's chemometrics web page and references therein:
+
+=over 4
+
+=item * Archive from 1998: L<https://web.archive.org/web/19981206200518/http://chem1.nrl.navy.mil/~shaffer/chemoweb.html>
+
+=item * C<http://chem1.nrl.navy.mil/~shaffer/chemoweb.html> (broken link).
+
+=back
+
+=back
 
-Numerical Recipes (bla bla bla XXX ref).
 
 The demonstration (Examples/Simplex/tsimp.pl and tsimp2.pl).